Windows 10 dual-stack IPv4 / IPv6 client assigned both IPv4 and IPv6 DNS servers, how does it decide which to use?

by slantalpha   Last Updated August 15, 2019 10:00 AM

I have a Windows 10 dual-stacked client receiving both IPv4 and IPv6 DNS server addresses. The IPv4 DNS server is assigned with "regular" DHCP, while the IPv6 DNS server is assigned with a stateless DHCPv6 server.

I did a Wireshark on all the DNS lookups, and it looks like Windows is using both DNS servers for both A (IPv4) and AAAA (IPv6) records.

Does anyone know how the name resolver in Windows 10 decides which DNS server (v4 / v6) to use?

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